関連する実験動画
Updated: Aug 14, 2026
11:32
Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
Published on: December 4, 2010
生体細胞におけるプレ-mRNAスプライシング因子の動態
T Misteli1, J F Cáceres, D L Spector
1Cold Spring Harbor Laboratory, New York 11724, USA.
Nature
|May 29, 1997
まとめ
核の斑点は,トランスクリプション中に活性遺伝子のスプライシング因子を動的に供給する. これは,原核がこれまで理解していたよりもダイナミックで,遺伝子発現の調節に影響を及ぼすことを明らかにしています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- プレメッセンジャーRNA (pre-mRNA) スプライシングは,多数のスプライシング要因を含む重要な共同転写プロセスです.
- 哺乳類の核では,これらの要因は,スペックルとして知られる異なる領域に集約されます.
- 斑点の正確な機能と転写とスプライシングのインビボ組織は,まだ完全に理解されていません.
研究 の 目的:
- 生体細胞の核内のスプライシング因子のダイナミックな行動を調査する.
- 活性遺伝子転写とプレ-mRNAスプライシングの文脈における核スペックルの役割を明らかにする.
主な方法:
- スプライシング因子ダイナミクスを観察するために,生細胞画像技術が採用されました.
- この研究では,遺伝子活性化に対する斑点の反応と転写阻害剤の効果をモニターした.
- タンパク質キナーゼおよびフォスファタゼ阻害剤に対する感受性を評価した.
主要な成果:
- 核の斑点は高いダイナミズムを示し,特に近くの遺伝子の活性化に反応する.
- スプライシングファクターの再分布は,転写活性化時にスペックルから活性遺伝子部位に観察されました.
- これらのダイナミックな変化はRNAポリメラーゼIIの活性に依存し,キナーゼ/フォスファタゼ抑制に敏感であった.
結論:
- 核斑は貯蔵庫として機能し,遺伝子を活発に転写するスプライシング因子を供給します.
- インターフェーズ核は高度にダイナミックな環境であり,その静的性質に関する以前の仮定に挑戦しています.
- Speckleダイナミクスは,トランスクリプション活動と規制信号伝達経路と密接に関連しています.
関連する概念動画
02:01pre-mRNA Processing
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
02:31Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
02:22Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
02:51mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
02:22Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
02:51mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability